Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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NY abbreviation of "New York," an eastern U.S. state between the Great Lakes and the Atlantic; New York State
Y chromosome a sex chromosome that occurs only in males, paired with an X chromosome, and is responsible for male sex characteristics. (Cf. X chromosome.)
y-axis in a two-dimensional coordinate system, the vertical axis along which the y ordinates are measured. [2 definitions]